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The reading of an ideal voltmeter in the circuit shown is, (1) 0.4 \mathrm{~V} (2) 0.6 \mathrm{~V} (3) 0 \mathrm{~V} (4) 0.5 \mathrm{~V}
Physics | Physics
The reading of an ideal voltmeter in the circuit shown is, (1) 0.4 \mathrm{~V} (2) 0.6 \mathrm{~V} (3) 0 \mathrm{~V} (4) 0.5 \mathrm{~V}

Answer (1)
Sol. Current in \mathrm{APB}=\frac{2}{50} \mathrm{~A}
Current in A Q B=\frac{2}{50} A
\Delta V from A to P
\mathrm{V}_{\mathrm{A}}-\frac{2}{50} \times 20=\mathrm{V}_{\mathrm{P}}

\Delta V from A to Q
\begin{array}{l} V_{A}-\frac{2}{50} \times 30=V_{Q} \\ V_{P}+\frac{2}{50} \times 20=V_{Q}+\frac{2}{50} \times 30 \Rightarrow V_{P}-V_{Q}=0.4 V \end{array}

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